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BU21077MUV

TSZ02201-0L5L0F300820-1-2

© 2013 ROHM Co., Ltd. All rights reserved.

14.Jul.2016 Rev.002

www.rohm.com

TSZ22111・15・001

Block Diagram

LDO15

LDO25

VREF

OSC

Sensor

AFE

C/V

Converter

AVDD

DVDD

SIN*

LOGIC

AFE

MPU

WRAM

VDD

VSS

AFE

Control

INT

WDTR

POR

HOST I/F

TEST

SCL

SDA

PRAM

RSTB

A/D

Converter

Figure 6. Block Diagram

Description of Blocks

●Sensor AFE, C/V Converter

Convert from capacitance to voltage for each sensor.

●A/D Converter

Convert from analog value to digital value.

●LDO25

2.5V output LDO for Sensor AFE, C/V Converter, and A/D converter.

●LDO15

1.5V output LDO for OSC and Logic blocks.

●OSC

Oscillator.

●POR

Power-On-Reset for system reset.

●MPU

Control sensor and sequence by program.

●PRAM

8kbyte Program RAM of MPU. It needs to download program from host.

●WRAM

Working RAM for MPU.

●HOST I/F

2-wire serial bus interface compatible with I2C protocol.

●AFE Control

Control sequencer for Sensor AFE, C/V Converter, and A/D Converter.

●WDTR

Watchdog timer reset. It issues a reset when the MPU is hang-upped.